As a superhard tool material, diamond has been used in cutting machining for centuries. In the process of cutter development, from the end of 19 to the mid-20th century, the cutting tool material is the main representative of High speed steel. 1927 Germany first developed cemented carbide tool materials and gained widespread application; In the 1950 of the 20th century, Sweden and the United States made synthetic diamonds, and cutting tools entered the period with superhard material. In the 1970 of the 20th century, people used high pressure synthetic technology to synthesize polycrystalline diamond (PCD), to solve the rare natural diamond, the expensive problem, so that the application of diamond tools extended to aviation, aerospace, automobiles, electronics, stone and other fields.